Split pulley



Patented Dec. 25, 1888.

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J.'T. WILLINGHAM.

* SPLIT PULLEY. No. 895,256.

UNITED STATES PATENT OFFICE.

JOHN T. \VILLINGIIAM, OF CIIATIANOOGA, TENNESSEE.

SPLIT PU LLEY.

SPECIFICATION forming part of Letters Patent No. 395,256, dated December25, 1888.

Application filed March 13, 1 8 88.

T0 aZZ whom it may concern;

Be it known that I, JOHN T. \VILLTNGHAM, a resident of Chattanooga, inthe county of Hamilton and State of Tennessee, have invented certain newand useful Improvements in Split Pulleys; and I do hereby declare thefollowingto be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same.

This invention relates particularly to split pulleys of wood. Itsobjectis to increase the strength and durability of the pulley and toprovide means for conveniently adapting the same pulley to shafts ofdifferent diameters, while decreasing the liability of the pulleyturning upon instead of with the shaft,

In the accompanying drawings, Figure 1 is a side elevation of thecomplete pulley. Fig. 3 is a section on the line :1 y of Fig. I. Fig.

b is a section through the rim, showing the manner of joining the partscomposing the rim. Fig.1 is asection on the line a 1 Fig. 1.

I am aware that many of the features of constriu-tion shown anddescribed have been set forth inprior patents, and I do not thercforeclaim novelty, except as hereinafterspmciiied.

In the drawings, A A are circular rimsegments, each of nearly onehundred and eighty degre s, made up of a series of plane plates Q unitedto form the belt-surface.

B B are two nearly-diametrical spoke-arms lying upon opposite sides ofthe center and joined at each end, respectively, to the rimsections nearthe ends thereof by means presenting nothing new.

(1 are intermediatespoke-amnsthat may be increased in number or omittedentirely. Two similar blocks, 1) I), are gained. into and secured to theadjacent tacos, respectively, of the arms I 13, near the middle thereof.These blocks are cut away to receive, respectively, the exteriorlynoncylindrical blocks E E, which, however, are not united to the blocksI) I). Each of the blocks E E is provided upon its inner face with acylindricalgroove at right angles to the plane of the pulley. Thegrooves register with each other and toi the blocks E E.

Serial No. 267,130- (No model.)

gether form a little less than a complete circle when seen axially.

The two arms I I and the intervening blocks I) l) are pierced for thepassage of bolts G G, which, however, do not pass through \Vhen thepulley is placed upon a shaft-as F, for example-the blocks E E serve asbushings and are drawn firmly against the shaft by the bolts G (i and bybolts G G, passing through the spoke-arms B l3 near the rim of thepulley.

I E the blocks I) D E E be properly proportioned with reference to eachother and to the diameter of the shaft, the latter will prevent theblocks 1) and E, respectively, from meeting the correspomling blocks, IDE, and the entire strain. of the bolts will be exerted in pressing thebushing-blocks against the shaft, and evidently the same force mustprevent the slipping of the bushing longitudinally in the blocks I) D.The pulley is thus securely mounted upon the shaft with no possibilityof tanning upon the bushing itself, owing to the non-cylindricalexterior of each half of the latter.

The rim of the pulley formed from the usual plane members Q, sufficientin number to give the required thickness or width to the rim, and theseare secured together by dowelpins J .I, preferably parallel to the shaftand driven into position while coated with glue or other adhesivesubstance. They are found practically to give in a high degree lightnessand durability under all conditions of use, being unaffected bytemperature and moisture.

Pulleys of this kind are made with the same recess for bushing-blta'ks,and the latter are all of the same size and form of exterior, but aregrtmved for shafts of diltcrent sizes, and as none of the bolts passthrough the blocks new or ditiertmt ones may be inserted in any pulleyby simply loosening the nuts upon the bolts uniting the halves. When theblocks E E are formed as shown, they autonnttically adjust themselves inposition and shrinkage of the wood is of little detriment in any way.

W hat I claim is In a wood split pulley, the con'ibination, with twosemicircular rim-sections, each having a chord-like arm joining pointsnear its ends, of two equal slightly-separated hub-sections resting ingains in the inner or contiguous faces of the arms, respectively, abushing composed of two slightly-separated similar parts, eachinternally grooved to fit the shaft and externally fitting anon-cylindrical seat in one of the hub-sections, and bolts passingthrough both arms and both hubsections Without the bushingand adapted toclamp the bushing upon the shaft, substantially as IO set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

JOHN T. XVILLINGHAM.

\Vitnesses:

FREDERICK GATES, C. 0. SMITH.

